Grinding-plates



D. MALONEY.

GRINDING PLATES.

AAAAAAAAA 0N FILED FEB 24.1920.

1,369,685, I Patented Feb. 22, 1921.

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UNITED STATES DANIEL MAILO'NEY, or SPRINGFIELD, orno, ASSIGNOR TO THE BAUER BROTHERS comrm, or srnmermnn, 01110, A. conronarron or 01110.

Specification of Letters Patent.

GRINDING-Pumas.

Patented Feb. 22, 1921.

Q, ,il aaetn med February 24, 1920. Serial No. 360,588.

' Beit'know'n that '1, ZDANIEL MALONEY, a

"Plates, of which the following is a specification.

My invention relates to grinding plates and more particularly to grinding plates for use in mills employing opposing plates rotating in opposite directions although they may be used when one of the plates is held stationary.

In this class of mills the material to be ground is fed through a central opening and discharges at the periphery of the plates.

The object of my invention is to control the travel of the material being ground so as to more evenly distribute the wear over the entire grinding surface of the plates and at the same time give a more efficient service both as to the quality and quantity of the product.

Figure 1 is a plan view of a portion of a plate embodying my improvements.

Fig. 2 is a vertical section of two opposing plates and the heads upon which they are mounted.

Fig. 3 is a side view of one sector of one of the plates with the chordal ribs of one of the opposing plates shown in dotted lines.

Referring to the drawings, 1 and 2 represent two opposing grinding plates as a whole, which are removably secured'to heads 3 in the usual way. Each plate is divided into sectors, an entire sector 6 and two a'djacent partial sectors a and a being shown in Fig. 2. Each sector is provided with bolt openings 4 to receive the bolts 5 which secure the same to its head.

Carryin out my invention I provide each sector wit a peripheral circular rib 6, a series of long rib portions 8, 9, 10 and 11 formed as. chords of concentric circles which have their centers at the axis A of the plate, and a series of short connecting rib portions 8*, 9 and 10 which unite with corresponding rib portions on adjacent sectors to also form chords of the same circles. The rib portions 8, 9, 10 and 11 are arranged parallel with each other and are of different len hs, the rib 11 extending entirel across t e plate sector while the other ri portions gradually-shorten in length outwardly. The short rib portions 8*, 9 and 10. are also arranged parallel with each other and increase in length outwardly.

plate will be less than the least distance be-.

tween the inner side of the next outer ib portlon of the opposing plate and the axis of its plate, this likewlse being true with respect to the rib portions 8 and the peripheral IlbS 6 of the respective plates, and, as will be apparent, is true of the shorter rib portlons. As a specific example of this, tor instance, the distance between theouter side of each rib portion 10 at the respective ends thereof and the axis of the plate is less than the distance between the inner side of each rib portion 9 midway its length and the axis of the plate. This arrangement allows for more or less clearance between any one of the ribs and the next succeeding outer rib on the opposing plate, or, in other words,

prevents those ribs from overlapping each other as the plates are revolved, resulting 1n an Improved action which more evenly distributes the material and reduces the wear on the plates.

As before stated the long rib portions 8, 9 and 11 are ofdifi'erent lengths, and it will be seen that the short rib portions are arranged at an angle to the long portions. As the opposing plates revolve, this results in opposing or corresponding ribs forming pockets as represented at .12, 13, 14 and 15 of varying sizes, gradually decreasing outwardly. These pockets will be triangular in form, the different lengths of the rib portions resulting in varying triangular pockpockets which will proportion ets whose maximum sizes decrease toward same length as isalso true of the innermost series of chordal'ribs, but thev rib portions of each series of intermediate chordal ribs vary in'length, each series of alternate rib sectlons being of the same length.

Referrin to Fig. 2, it will be seen that the outer aces of the grindin ribs 9, 9,

10, 10 and 11, as well as the ad acent radial ribs 7 are formed on curved lines which are farthest removed from each other between the ribs 11 and gradually approach each other to a point between the ribs 8 8 and 9, 9", thence continuing on straight lines to the outer periphery of the plates. Thls results in a wide open throat at the point of supply which gradually decreases as the material is reduced to a point where it will be of uniform width for a substantial distance alon the outer surface of the plates. 7

. wllile the longitudinal centers of each of the radial ribs 7 are on a trueradial line, yet it will be noticed that the side walls of each radial rib diverge outwardly so that the rib gradually increases in width outwardly. B this arrangement the heavier part of the ra ial ribs is located at the point where the atest wear occurs.

Each si e of each l plate has corresponding ribs, as shown in ig. 2, so that when the plate becomes worn it can-be reversed to present a fresh surface, thereby doubling the usefulness thereof.

having a series of ribs shaped to extend on lines to form chords of concentric circles, the chordal sections being proportioned and arranged to give a clearance between the- IlbS of one plate and the next outer ribs of the opposing plate, the corresponding ribs of the respective plates forming pockets of diminished size toward the outer periphery of the plates.

A pair of grinding plates, each plate havmg'a series of corresponding ribs, one or more of said ribs extending on a line shaped to form chords of a circle with alternate chords of the same length and of difof said ribs being1 ferent lengths than the other chords, s0.that such rib of one plate will coact with the correspondingrib of the other plate to form triangular sha d pockets.

3. A pair 0 grinding plates, each plate having correspondi ribs, the ribs of each plate increasing .in ength toward the periphery of the plate, each rib being extended on a line so shaped as to form chords of a circle, alternating chords of one or more ofthe same length and of difierentlengt so that such rib or ribs will coact with the corresponding rib or'ribs of the other plate to form triangular shaped pockets. g 4. A pair of grinding plates, each plate having a series of ribs correspondin with ribs on the opposing plate, each rib extending on a line forming chords of a concentric circle, the chords formin some of said ribs being of the same lengt and the chords formin the other ribs varying in length with afiernate chords of the same length. I

5. In an annular grinding plate, a eripheral rib, a plurality of radial ribs and a series of ribs parallel with each other forming chords of concentric circles having their centers at the axis of the plate, the respec tive ends of each of the outer chordal ribs having a less radius than said peripheral r1 I s than the other chords,

6. In an annular grinding late, a peripheral rib, a pluraht of ra 1al ribs and a series of ribs aral el with each other forming chords of concentric circles having their centers at the axis of the plate, the respective ends ofeach of the inner chordal ribs having a less radius than a point on the inner surface of the next outer rib midway of its length. I

7. In an annular grinding plate, a peripheral rib, a pluraht of radial ribs and a series of ribs aral el with each other forming chords 0 concentric circles having their centers at the axis of the plate, the

respective ends of the outer chordal ribs having a less radius than said peripheral rib and the respective ends of each of the other chordal ribs having a less radius than a point on the inner-surface of the next outer rib midway of its length.

In testimony whereof, I have hereunto set my hand this 19th day of Februa 1920. DANIEL MAL NEY. Witnesses:

Pnncr NORTON, Oms. I. WELOH. 

